895 results about "Extreme position" patented technology

A muzzle brake for a gun which comprises an annular member mountable on the firing end of the muzzle of the gun, which member comprises a pair of concentrically located annular elements of which the first one is mounted stationary relative to the muzzle of the gun and the second one is slidably movable against the biasing action of a spring relative to said first element in a direction opposite the firing direction of the gun, said movement taking place under the influence of the exhaust gas resulting from the firing of a projectile by the gun, and said movement being from a first extreme position into which said spring forces said second element, in which position the brake is in the "off' position, to a second extreme position where the brake is in the fully "on' position, in which position said exhaust gas can force the first element, and hence the muzzle of the gun, to move in the firing direction, and so counteract the recoil action of the gun.

A holder for a mobile electronic device includes first and second clamping jaws, at least the first clamping jaw being displaceable toward the second clamping jaw to clamp the mobile electronic device. The holder also includes a stop element and an entraining element connected to the first clamping jaw, the entraining element being shaped so that it is displaceable with respect to the stop element, namely jointly with the damping jaw connected to it, in which case at least one extreme position corresponding to the maximum opening of the clamping jaw is defined in the displacement path by the impact of the stop element against the entraining element. The holder includes a damper element, which is mounted on the stop element and damps the stopping of the stop element against the entraining element.

Digital fluid pumps having first and second electromagnetic actuators formed in part by a piston to alternately drive the piston in opposite directions for pumping purposes. The piston motion is intentionally limited so that the electromagnetic actuators may operate with a high flux density to provide an output pressure higher than that obtained with conventional solenoid actuated pumps. The electromagnetic actuator coils are electrically pulsed for each pumping cycle as required to maintain the desired fluid flow and output pressure, with the piston being magnetically latchable at one or both extreme positions between pulses. Alternate embodiments and control methods and systems are disclosed.

The invention discloses a coarse tuning and fine tuning combined infrared image automatic focusing method which is characterized by controlling a motor to operate positively and negatively according to an automatic focusing command; controlling the motor to move to the negative direction with a relatively-large step length from the extreme position; in the moving process, calculating definition evaluation function value in real time; and when the function value reaches maximum value, controlling the motor to move to the negative direction again with a relatively-small step length and calculating definition evaluation function value in real time, and the maximum value place is the clearest imaging place. According to the method, combination of coarse tuning and fine tuning is realized through different motor movement step lengths, and automatic focusing calculation is carried out through two image definition evaluation functions, thereby guaranteeing an infrared imaging system to enable the focal length to be adjusted to the clearest imaging place quickly and realizing the optimum focusing effect; and the method is less in computation burden, high in real-time performance, beneficial to engineering application, and capable of meeting the definition requirement of the infrared imaging system.

An electric protective method and a device when a mechanical brake of a frequency conversion elevator fails is characterized in that an elevator controller real time monitors the displacement and the speed of an elevator car, and can immediately judge the mechanical brake of the elevator fails and the elevator slips if any unallowable displacement and certain moving speed are found to the elevator car before the elevator controller makes any direction and speed instruction. At this time, the invention can immediately send the zero-speed running signal to a frequency converter, and use the frequency converter to control the zero-speed torque moment produced by dragging a motor to brake the elevator car to stop, so as to ensure the safety of the people going in and out of the elevator car; meanwhile, gives out the alarm signal to notify the people in the elevator car to quickly leave, and then controls to close the door. In case of any irreversible failure to the mechanical brake, the invention controls the elevator car to run at lower speed in the slipping direction, until the elevator runs to an extreme position and stops. In this way, the invention can prevent severe accidents of shearing injury to people and high-speed crash because of high-speed slipping of the elevator.

An adjustment mechanism for selectively tightening the snare wires of a snare drum, having a camming mechanism cooperatively formed by two concentric members with an inherent level of friction that allows it to be reliably set at either extreme position of adjustment of the tightness of the snare wires or at any desired intermediate position of adjustment, thus allowing the musician a full range of choice of the musical tones or effects to be produced by the snare wires.

A nacelle for double-flow engine with a cowling and at least one thrust reverser, the thrust reverser having an internal door and an external door arranged in the cowling, and means for simultaneously shifting these doors between a stable retracted position in which the doors are integrated in the cowling and a stable deployed position in which the internal and external doors are positioned at least partially inside and outside of the nacelle, respectively, to deflect the secondary flow and to generate a thrust reversal. The means for simultaneously shifting the doors comprise an actuator, one extremity of which is linked to one of the doors to shift this door between the extreme positions, and at least one linkage element linked to the doors to pivot by its extremities, so that the shifting of the door entails the shifting of the other door between these extreme positions.

A gearshift mechanism extreme position self-learning control method for an AMT system is adopted for controlling the working sequence of the AMT system, and comprises the steps that firstly, an input signal of a self-learning module is acquired and input by a TCU (the control unit) and a self-learning bit zone is output to other subsequent modules of the AMT system; then an ATM action sequence module selects an action sequence matrix according the bit zone, and decoding is conducted according to action time sequence, so that the target position of each gearshift mechanism is obtained; and finally, the gearshift mechanism is driven to act by a motor driving module. The self-learning module conducts the in-place detection according to the actual position of the gearshift mechanism, and if the self learning process is completed, the extreme position parameter of a mechanical mechanism is updated and stored automatically. Therefore, when temperature is changed greatly or traveled distance is accumulated to a certain degree, the precision and the speed of motor driving can be guaranteed.

A clamp for attaching a medical device to an OR table rail, including two closable clamp jaws that close to an extreme position that leaves inadequate room for the rail. A handle actuates the jaws apart, and a spring biases them together through a range of jaw positions. A lock member is biased to swing through a range of lock positions in which it progressively engages and locks the jaw mechanism through its range of jaw positions. A pair of bars carries the medical device on the clamp, and allows it to be adjustably positioned with respect to the rail.

The invention discloses a position detecting system for the edge of a winding-up H-shaped wheel of a wire drawing machine and a control method thereof. The method comprises the following steps that: (1) two extreme positions are calibrated; in the process that a controller adopts a motor to drive a bracket to move on a lead screw, the controller acquires distances from displacement sensors to theinner edge of the H-shaped wheel by the two displacement sensors and calibrates the two extreme positions according to the distances; angle values of encoders corresponding to the two extreme positions are acquired; and (2) the bracket is controlled to do reciprocating movement between the two extreme positions, and the controller drives the bracket to move along the lead screw by the motor, and controls the motor to rotate reversely when the bracket reaches the extreme positions, so that the purpose that the bracket moves between the two extreme positions in a reciprocating manner till the wire arranging procedure on the H-shaped wheel is finished. The position detecting system has the characteristics of high detection accuracy and easiness in implementation and the like and can effectively avoid the phenomenon of wire stacking at the edge of the H-shaped wheel.

The invention provides a control device and method for a vacuum circuit breaker permanent magnetic mechanism based on the double signal tracking, and belongs to the field of the automatic control of electrical equipment. According to the invention, a double closed-loop PID control algorithm is adopted to enable a vacuum circuit breaker permanent magnetic operating mechanism contact terminal with movement characteristics to be in a controlled state, so as to improve the robustness and control precision of a control system; field coil electric current of a current sensor measurement mechanism in the control device is utilized to enable the field coil electric current to be subjected to whole-course control, so as to avoid the possibility of coil burning down; a contact terminal journey dynamic curve is selected to reduce the impulsive force of a moving contact reaching an extreme position, so as to improve the reliability of the mechanism action and prolong the service life of the mechanism; the divide-shut brake voltage is improved, and the contact terminal journey curve is selected to reduce energy loss of the contact terminal caused by collision, so as to achieve the energy-saving effect, enable the circuit breaker to complete brake reclosing operation for more times under the same application condition, effectively prolong the service life of the circuit breaker, and improve the stability of an electric power system simultaneously.

The invention relates to a method for calibrating the zeroing of a servo mechanism, which comprises the following steps: driving a servo motor in a low rotation speed mode to drive a moving part to move to a first extreme position and a second extreme position respectively; in the moving process of the moving part, continuing to detect whether the motor control energy of the servo motor exceeds afirst threshold value or a second threshold value; acquiring a motor coordinate value corresponding to the first or second extreme position when the motor control energy is increased to exceed the first threshold value or the second threshold value when the moving part reaches the first or second extreme position; and finally, calculating a conversion function of the motor coordinate and the actual coordinate by utilizing an actual coordinate value of the first extreme position, an actual coordinate value of the second extreme position, the motor coordinate value corresponding to the first extreme position and the motor coordinate value corresponding to the second extreme position. The method can simplify the structure of the servo mechanism and avoiding the use of an additional detectiondevice for determining whether the moving part reaches the extreme position.

A method for removing a replaceable tip used with a suction device for dispensing a liquid removes the tip by bringing a removal device, arranged in an air space formed jointly by a sample space of a replaceable tip and a cylindrical space of an end part of a suction device, movable between its two extreme positions, namely an inner home position and an outer removal position, into cooperation with an inside surface of the replaceable tip mounted on the end part whereby the movement of the removal device into its removal position causes the replaceable tip to be detached from the end part. A suction device is provided for using the method.

A dynamic or aerodynamic fin comprising at least two parallel arranged fin sections. At least one fin section comprises a rotational axis for installing the fin section by a rotation shaft. An end stop is provided for stopping the rotational movement of the fin section to define an extreme position. In the extreme position the fin sections provide a substantially cambered shape to the fin. The dynamic fin is improved in that it comprises a pair of coupling elements. A first fin section is coupled to a second adjacent fin section by a pair of a first and second coupling elements. The first coupling element is complementary to the second coupling element. The first coupling element is part of, preferably integral, with the first fin section and the second coupling element is part of, preferably integral, with the second fin section.

The invention discloses a method for determining the local strength of a bottom structure of a ship launched from a berth. The method is characterized by comprising steps of firstly, simplifying the integral structure of the ship into a variable-cross-section thin-walled beam along the length direction of the ship, perpendicularly flexibly supporting buttresses, selecting a series of gliding positions as working conditions when the ship glides along the berth, acquiring values of buttress reaction force born by the ship structure corresponding to the various buttresses, and determining various stress extreme positions of the structure; secondly, analyzing the strength of the structure corresponding to the stress extreme positions by the aid of a local three-dimensional finite element model, and determining the structural strength of various regions. The method has the advantages that integral ship beam computation is combined with a local three-dimensional finite element model analysis process, so that modeling workload can be greatly reduced as compared with a whole-ship three-dimensional structural finite element modeling analysis process in the prior art, the computation time can be saved, and the analysis speed can be increased.

The invention relates to headsets comprising at least a supporting shell and a moving visor that can be displaced between two extreme positions.

The headset includes a system for securing the visor in any position between the two extreme positions by friction between the visor and the supporting shell, the friction being produced by at least one microfibre felt element.

The invention applies to the field of headsets in general for users of motorized craft such as in aeronautics and automobiles for example.

In one example, an actuator mechanism comprising: one or more coils for establishing a magnetic field; a rotating permanent magnet, which has at least one extreme position depending on the magnetic field; and driving members, which are coupled to the permanent magnet and by means of which the members coupled to the actuator mechanism are driven. In another example, an actuator mechanism comprising: one or more wires, which are manufactured of a shape memory alloy that shrinks when heated; and driving members, which are coupled to said wire and by means of which the members connected to the actuator mechanism are driven.